@article{ASNSP_2009_5_8_4_805_0,
     author = {Gentili, Graziano and Stoppato, Caterina},
     title = {The open mapping theorem for regular quaternionic functions},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {805--815},
     publisher = {Scuola Normale Superiore, Pisa},
     volume = {Ser. 5, 8},
     number = {4},
     year = {2009},
     mrnumber = {2647912},
     zbl = {1201.30067},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_2009_5_8_4_805_0/}
}